Sorry for confusing, I didn't want to overwhelm with a bunch of unnecessary info and keep the original post short.
Will try your solution in the next maintenance window.
[quote]
Out of curiosity, why are you receiving a default route from AS1, then readvertising the default back to AS1?
[/quote]
Basically rtr1 and rtr4 both are the exact same physical ISP MPLS PE device, only in different vrfs, thus having same AS#
On rtr1<>rtr2 exchange: rtr2 has public inet peering. and receives 0/0 to public inet.
On rtr2<>rtr3 exchange: this default route must be propogated to internal corporate WAN
Hopefully I managed to explain that clear enough.